Please help me, I am lost from 3.2 going down

Find the lateral surface area plzzz

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !